t vs OSLA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
t
Explore the features of an insulin pump's touchscreen interface without needing a prescription. This app is ideal for individuals with diabetes, their caregivers, or healthcare professionals to understand pump functionality.
- Explore touchscreen interface
- Demonstrates pump features
- No prescription required
- Educational tool
- Mobile device compatible
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The t:simulator™ App is an easy way to explore the simple touchscreen interface of the t:slim X2™ Insulin Pump from Tandem Diabetes Care, no prescription or insurance verification required! Whether you’re a person living with diabetes, a relative or caregiver, or a healthcare provider, we make it simple to explore the t:slim X2 Pump’s features on your mobile device. THIS APPLICATION IS FOR DEMONSTRATION PURPOSES ONLY. IT SHOULD NOT BE USED FOR THERAPY DECISIONS. Due to the variety of sizes of compatible devices, the t:simulator App may not display the pump at actual size. Actual size is 2” x 3.13”. Please refer to the Technical Specifications in the Resources section of the app for more detailed information.
OSLA
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OSLA measures the surface area of ocular surface lesions from a photo. Capture a close-up of the eye, mark the iris as an 11.5 mm reference, trace the lesion, and OSLA reports the area in square millimetres. Built for eye care clinicians and researchers who need a consistent, repeatable way to document lesion size in clinic or in the field. How it works: - Capture with the guided camera (near focus lock, flash at capture) or pick an existing photo - Draw around the iris. Its 11.5 mm average diameter sets the real-world scale - Trace the lesion freehand, or tap point by point - Read the area in square millimetres, with maximum and minimum dimensions The saved photo includes the annotations and a small measurement card, so the result can go straight into your records. Everything runs on the device. No account, no upload, no tracking. Photos stay on your phone unless you choose to share them. OSLA is useful for documenting and monitoring conditions such as ocular surface squamous neoplasia, pterygium and conjunctival naevi. It is a documentation aid for clinicians, not a diagnostic device, and it does not replace clinical judgement.
Screenshots
Verdict
The clearest difference is update cadence: OSLA at daily against t's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
t ships an update every 2 months, OSLA daily. The most recent releases landed on October 13, 2026 and September 18, 2026 respectively.
| Parameter | t | OSLA |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (116 ratings) — better | — |
| Positive reviews | 42.4% of reviews | — |
| Number of ratings | 116 — better | — |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 19 MB |
| Age rating | 4+ | 17+ |
| Developer | Tandem Diabetes Care, Inc. | Chun-Huei Liu |
Bugs and requests
t
Reported bugs
13 issues- App won't open once downloaded
- Simulator crashes on launch
- App broken on iOS 12
- Simulator app broken on iOS 12
- Simulator crashes as soon as app is open
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- Simulator not working
- App crashes when opening on iPhone X
- Simulator crashes on iOS 12
- Simulator doesn't work
- App bombs on launch
- Lagging and not working properly
- Doesn't update as often
- US version installed on iPhone, needs German version
Requested features
14 requests- Actual app to control and manage the pump
- App available in Canada/Europe
- Display beep noises for alerts
- Simulate real-world issues like occlusions
- Ability to simulate changing the pump
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- Bolus from the app
- Option to change mmol/l to mg/dl
- Bluetooth control of the pump
- App to upload reports from the pump for iPad
- Integrate with Apple Watch for alerts
- Actual app that sends information to phone
- Simulate confirmation screens and alarms
- More realistic simulation of pump usage
- Display insulin on board information
OSLA
Not enough reviews yet to summarise bugs or requests.
In-app purchases
t
No in-app purchases
OSLA
No in-app purchases









